nouveau: add vmap support to nouveau prime support

Tested sharing to udl.

Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 42 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index 634d222c93de..8613cb23808c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -123,6 +123,9 @@ struct nouveau_bo {
 
         struct drm_gem_object *gem;
         int pin_refcnt;
+
+        struct ttm_bo_kmap_obj dma_buf_vmap;
+        int vmapping_count;
 };
 
 #define nouveau_bo_tile_layout(nvbo)                            \
diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c b/drivers/gpu/drm/nouveau/nouveau_prime.c
index e2bcd4e54654..a89240e5fb29 100644
--- a/drivers/gpu/drm/nouveau/nouveau_prime.c
+++ b/drivers/gpu/drm/nouveau/nouveau_prime.c
@@ -66,6 +66,43 @@ static int nouveau_gem_prime_mmap(struct dma_buf *dma_buf, struct vm_area_struct
         return -EINVAL;
 }
 
+static void *nouveau_gem_prime_vmap(struct dma_buf *dma_buf)
+{
+        struct nouveau_bo *nvbo = dma_buf->priv;
+        struct drm_device *dev = nvbo->gem->dev;
+        int ret;
+
+        mutex_lock(&dev->struct_mutex);
+        if (nvbo->vmapping_count) {
+                nvbo->vmapping_count++;
+                goto out_unlock;
+        }
+
+        ret = ttm_bo_kmap(&nvbo->bo, 0, nvbo->bo.num_pages,
+                          &nvbo->dma_buf_vmap);
+        if (ret) {
+                mutex_unlock(&dev->struct_mutex);
+                return ERR_PTR(ret);
+        }
+        nvbo->vmapping_count = 1;
+out_unlock:
+        mutex_unlock(&dev->struct_mutex);
+        return nvbo->dma_buf_vmap.virtual;
+}
+
+static void nouveau_gem_prime_vunmap(struct dma_buf *dma_buf, void *vaddr)
+{
+        struct nouveau_bo *nvbo = dma_buf->priv;
+        struct drm_device *dev = nvbo->gem->dev;
+
+        mutex_lock(&dev->struct_mutex);
+        nvbo->vmapping_count--;
+        if (nvbo->vmapping_count == 0) {
+                ttm_bo_kunmap(&nvbo->dma_buf_vmap);
+        }
+        mutex_unlock(&dev->struct_mutex);
+}
+
 static const struct dma_buf_ops nouveau_dmabuf_ops =  {
         .map_dma_buf = nouveau_gem_map_dma_buf,
         .unmap_dma_buf = nouveau_gem_unmap_dma_buf,
@@ -75,6 +112,8 @@ static const struct dma_buf_ops nouveau_dmabuf_ops =  {
         .kunmap = nouveau_gem_kunmap,
         .kunmap_atomic = nouveau_gem_kunmap_atomic,
         .mmap = nouveau_gem_prime_mmap,
+        .vmap = nouveau_gem_prime_vmap,
+        .vunmap = nouveau_gem_prime_vunmap,
 };
 
 static int